Hotpoint FFA47X Fridge Freezer

[stj]

Re: Hotpoint FFA47X Fridge Freezer

triacs - stay away from.

the input and output are 230vac, but the control pin is 5v and if you short it - you blow the controller.

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

notches, circle in the corner etc are the same, just different makers using different markings.

meter both pins on the chip, and set the meter to 10vdc
i'm expecting (hoping) for either 3.3v or 5v

you WONT get a shock from the chip even if you stuck your finger on it.

What about the triacs? Should I check them too? I know they are big voltage and AC I think?

[budm]

Re: Hotpoint FFA47X Fridge Freezer

"Presumably meter on 600VAC. Touch ground first when I know where it is then probe chips." Set meter to DCV, 20V scale or auto range, check between GND pin and VCC pin as suggested.

[stj]

Re: Hotpoint FFA47X Fridge Freezer

notches, circle in the corner etc are the same, just different makers using different markings.

meter both pins on the chip, and set the meter to 10vdc
i'm expecting (hoping) for either 3.3v or 5v

you WONT get a shock from the chip even if you stuck your finger on it.

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

im sure stj will be along to advise shortly.

Got to be said, you guys are genii.

[vinceroger69]

Re: Hotpoint FFA47X Fridge Freezer

im sure stj will be along to advise shortly.

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

i would use ground on the chip its self says in the pdf just be really carefull probes dont slip just wait for someone else to confirm though.

Indeed. I was thinking I could use GND on the chip but I don't want to blow this chip up. I've no idea if I can use that ground.

Also looking at the data sheet this chip doesn't appear to match. The PDIP chip has a semi-circular indent in one edge but my chip has a semi-circular indent AND a circle indent too!

Check ST website and found an M93C86W ( that's a 33 page manual so not sure if this matters. Same voltage range though).

[vinceroger69]

Re: Hotpoint FFA47X Fridge Freezer

i would use ground on the chip its self says in the pdf just be really carefull probes dont slip just wait for someone else to confirm though.

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

thanks.

look at the datasheet, it shows the pin functions.
if you can safely do it, meter the voltage between VCC and GND

lets see if the chips are actually getting power!

Cool. OK. Tell me where a ground is on the board.

If I out my wellies on, am I right in saying I cannot get a shock providing I do not lean on fridge casing with another part of my body?

Board is high up so I'll need to stand on a chair (wooden by the way).

Presumably meter on 600VAC. Touch ground first when I know where it is then probe chips.

As I say if you can tell me where a suitable ground is then I'm good to go.

Also, need to be careful not to blow EEPROM as I obviously won't be able to reprogramme it!

[keeney123]

Re: Hotpoint FFA47X Fridge Freezer

thanks.

look at the datasheet, it shows the pin functions.
if you can safely do it, meter the voltage between VCC and GND

lets see if the chips are actually getting power!

Good place to start.

[keeney123]

Re: Hotpoint FFA47X Fridge Freezer

The copper trace you have bridged with wire is my guess.

Yes that is correct.

[stj]

Re: Hotpoint FFA47X Fridge Freezer

thanks.

look at the datasheet, it shows the pin functions.
if you can safely do it, meter the voltage between VCC and GND

lets see if the chips are actually getting power!

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

Sorry stj. Been out most of the day.

[stj]

Re: Hotpoint FFA47X Fridge Freezer

eeprom part number?
i need to get the pinout so we can check for the vcc supply.

[vinceroger69]

Re: Hotpoint FFA47X Fridge Freezer

The copper trace you have bridged with wire is my guess.

[Rhothgar]

Re: Hotpoint FFA47X Fridge Freezer

What's a land please?

[keeney123]

Re: Hotpoint FFA47X Fridge Freezer

I would concentrate on when you blew out the land on the board. Where does the run go to on the top side of the board. Instead of reading through all this post . Can you state the first problem you had before you blew you the land? When you blew out the land any component attached to that land could of been taken out. It would be dependent on what is the weakest point of the design.

[budm]

Re: Hotpoint FFA47X Fridge Freezer

"EDIT: reed switch fine continuity when magnet near and loses continuity when magnet removed." That is fine.

[keeney123]

Re: Hotpoint FFA47X Fridge Freezer

It's good to know that the wiring may be unaffected but I take it you didn't look back at Post 71 as previously suggested!!!

I did take a look at that why do you ask?

[stj]

Re: Hotpoint FFA47X Fridge Freezer

what is the part number on the 8pin eeprom on the top of the board?